The oil used by jewelers to lubricate clocks and watches costs about $3,000 a gallon.
41
The average car produces a pound of pollution every 25 miles!
18
Scientists in the UK are creating a smartphone app that will enable users to test for STDs.
0
The ball on top of a flagpole is called a 'truck'.
24
The life boat was patented in 1845!
29
A small airplane can fly backwards.
75